Use correct types for constants.

Otherwise the compiler might insert a conversion from float
to double and back.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36480 b3059339-0415-0410-9bf9-f77b7e298cf2
demux_lavf: Ignore failure to find stream info.

It is not necessarily fatal and allows playback of
HEVC ES streams.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36481 b3059339-0415-0410-9bf9-f77b7e298cf2